Make the sauce: In a small bowl, whisk soy sauce, rice vinegar, honey, sesame oil, chili flakes or sriracha, broth or water, and cornstarch if using. Set aside.
Heat the pan: Place a large skillet or wok over medium-high heat.
Add 1 tablespoon oil and let it shimmer.
Brown the turkey: Add ground turkey and break it up with a spatula. Cook 5–7 minutes, stirring occasionally, until no longer pink and lightly browned. Season with a pinch of salt and pepper.
Transfer to a plate if the pan feels crowded.
Soften aromatics: Add the remaining 1 tablespoon oil to the same pan. Add onion and the white parts of the green onion. Cook 2–3 minutes until slightly softened.
Add veggies: Toss in your mixed vegetables.
Stir-fry 3–5 minutes until crisp-tender. If using tougher veggies like broccoli or carrots, add a splash of water and cover for 1–2 minutes to steam.
Garlic and ginger: Push veggies to the edges. Add garlic and ginger to the center and cook 30 seconds until fragrant, then mix everything together.
Combine and sauce: Return turkey (and any juices) to the pan.
Give the sauce a quick stir and pour it in. Stir constantly 1–2 minutes until the sauce thickens slightly and coats everything.
Taste and adjust: Add more soy for salt, honey for sweetness, or chili for heat. Finish with the green parts of the green onion and sesame seeds.
Serve: Spoon over rice, noodles, or into lettuce cups.
A squeeze of lime brightens the whole dish.